Is the Persian calendar the same as the Solar Hijri calendar?

Yes. The Persian (Jalali / Shamsi) calendar is the Solar Hijri calendar used in Iran and Afghanistan. Its year begins at the spring equinox (Nowruz), and the first six months have 31 days, the next five have 30, and Esfand has 29 or 30.

How accurate is the conversion?

It uses Borkowski's 33-year-cycle algorithm, which exactly matches the observational Solar Hijri calendar across the full modern range, pivoting through the Julian Day Number. Round-trips are exact.

When does the Persian year start?

The Persian year begins on 1 Farvardin, which falls on the March equinox — Nowruz — around 20 or 21 March in the Gregorian calendar. That day is Persian New Year.

What are the Persian months?

The twelve months are Farvardin, Ordibehesht, Khordad, Tir, Mordad, Shahrivar, Mehr, Aban, Azar, Dey, Bahman and Esfand. The first six have 31 days, the next five have 30, and Esfand has 29 days (30 in a leap year).

How does a Persian leap year work?

A Persian leap year adds a 30th day to Esfand. Leap years follow a 33-year cycle tied to the astronomical equinox, which is why the algorithm-based conversion is needed for exactness rather than a fixed rule.

Why is the Persian year about 621 less than the Gregorian year?

The Solar Hijri epoch is the year of the Prophet's migration (Hijra) measured in solar years, so Persian year numbers run roughly 621–622 behind the Gregorian year for the same date.

Is my date uploaded anywhere?

No. The converter is privacy-first — all calculation happens locally in your browser and nothing is transmitted or stored.

Persian (Jalali) Calendar Converter

Persian (Jalali) calendar converter

Convert dates between the Gregorian and Persian (Solar Hijri / Jalali) calendars in both directions, with the weekday shown for each result. The Persian calendar is the official calendar of Iran and Afghanistan, so this is handy for reading Iranian dates, planning around Nowruz, or filling in forms that expect a Shamsi date.

How it works

The converter pivots through the Julian Day Number (JDN) — a continuous day count that both calendars can map onto:

Gregorian date  →  JDN  →  Persian date
Persian date    →  JDN  →  Gregorian date

It uses Borkowski’s 33-year-cycle algorithm for the Persian side, which matches the observational Solar Hijri calendar for every modern date, including leap years. Because both directions share the JDN pivot, a round-trip returns exactly the date you started with.

Example

The Persian New Year, 1 Farvardin 1403, converts to 20 March 2024 (Gregorian) — Nowruz. Going the other way, entering 2024-03-20 returns 1403-01-01 along with its weekday. Dates just before Nowruz fall in the previous Persian year (month Esfand), since the year boundary is the equinox, not 1 January.

It is privacy-first: nothing leaves your browser.